[Preetha Veeramalai (preetha-intel)]

Description

This PR adds Python bindings for the Model Package APIs. Python applications can now create, inspect and edit model packages, and select a variant and create an inference session from one. It also exposes set_ep_context_binary_information on ModelCompiler.

Changes

• Add pybind bindings for model package authoring (ModelPackage) and for loading and selecting a variant (ModelPackageContext, ModelPackageOptions, ModelPackageComponentContext).
• Add ModelCompiler.set_ep_context_binary_information.
• Link model_package into the Python module and export the new classes from onnxruntime.
• The bindings are not built in minimal builds.

Motivation and Context

The python API's are helpful in creating sample applications for public adoptions.

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